Test all leads that attach to your hard drive including electrical extensions EIDE,SATA
the leads from your motherboard to your hard drive make sure they have a secure dust free connections and are not faulty or just replace them they might be faulty
you might have a dirty graphics card if you remove your graphics card clean both card and socket restart your computer then reinstall it this should activate found new hardware wizard
Click start control panel administrive tools computer management device manager scroll to display adapters + to expand you might see a yellow question mark ? or exclamation mark ! or a red x right click select reinstall drivers if your computer came with a motherboard disc the drivers could be on it
or you might try these
http://ati-catalyst-drivers.en.softonic.com/ Optimise your ATi graphics card's performance
hope this helps
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